Add wezterm binds

utils.nix

@@ -1,4 +1,7 @@
-{ inputs, system, sources, ... }: {
+{ inputs, system, sources, ... }:
+let
+  pkgs = import inputs.nixpkgs { inherit system; };
+in {
   mkHost = host:
     inputs.nixpkgs.lib.nixosSystem {
       specialArgs = { inherit inputs system sources; };
@@ -11,4 +14,41 @@
         inputs.impermanence.nixosModules.impermanence
       ];
     };
+
+  # Build a standalone HM configuration for a given host NixOS config and
+  # home.nix file.  osConfig is injected as a specialArg so all modules that
+  # reference it continue to work.
+  mkHome = { hostConfig, homeFile, username ? "muon" }:
+    inputs.home-manager.lib.homeManagerConfiguration {
+      inherit pkgs;
+      extraSpecialArgs = {
+        inherit inputs system sources;
+        osConfig = hostConfig.config;
+      };
+      modules = [
+        homeFile
+        inputs.self.outputs.homeManagerModules.default
+        inputs.stylix.homeManagerModules.stylix
+        ({ osConfig, ... }: {
+          home.username = username;
+          home.homeDirectory = "/home/${username}";
+          # Mirror the stylix settings from the NixOS config so the standalone
+          # HM build has the same theme without re-declaring it.
+          stylix = {
+            enable       = osConfig.stylix.enable;
+            autoEnable   = osConfig.stylix.autoEnable;
+            base16Scheme = osConfig.stylix.base16Scheme;
+            image        = osConfig.stylix.image;
+            cursor       = osConfig.stylix.cursor;
+            # Forward individual font options; stylix derives fonts.packages
+            # internally as read-only so we must not forward that attr.
+            fonts.monospace  = osConfig.stylix.fonts.monospace;
+            fonts.sansSerif  = osConfig.stylix.fonts.sansSerif;
+            fonts.serif      = osConfig.stylix.fonts.serif;
+            fonts.emoji      = osConfig.stylix.fonts.emoji;
+            fonts.sizes      = osConfig.stylix.fonts.sizes;
+          };
+        })
+      ];
+    };
 }